Delete row ('2506', '20731') from daily_volatility

ticker_id 2506
day 20731
implied_open 1.508078247306817
implied_high 1.508078247306817
implied_low 0.86674812950476
implied_close 1.146139467953181
historical_open 0.8111873519724035
historical_high 0.8111873519724035
historical_low 0.8111873519724035
historical_close 0.8111873519724035
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